Compressor valve



March 24, 1931 R. w. DOEG COMPRESSOR VALVE Filed Dec. 16, 1927 INVENTOREdi 0 14 Does A TTORNE Y.

Patented Mar. 1931 NIT 1mm Paren OFFICE nALrn w.,nons, or'nn'rnorr,vrronieaiv, AssIGnoR To KnLvINATo oonrom 'rioiv,

. or nnrnorr, MICHIGAN, A CORPORATION or 'MIGHIGAN 1 1 fconrnnsson VALVEApplication filed December 16, 1927. 'Serial 5N0. 240,407.

My invention relates generally to fluid compressors and it hasparticular relation to a novel type of compressor discharge valve.

Heretofore, it has been customary to provide fiuid compressors withdischarge valves in which a single valve closing member moves to variousheights to, provide various sizes of openings for the escape of thecompressed 'fiu'id depending upon the Volume of the charge within thecylinder. By my invenk tion I have provided a movable valve closingmember which moves only when an excessive charge of compressed fluid iscontained within thecylinder and which is provided with additional meansfor permitting-the escape of the compressed fluid under normalconditlons without IIGOESSltBIflIlg movement of sald valve closingmember.

' 1 One object of my 1nvention is to provide a novel type of dischargevalve'for compressors. 7 Another object of "my inventionlc onsists inproviding a novel type of discharge valve comprising a complete valvemechanism mounted on a valve closing member A further object of myinvention is to provide a main discharge, valve which moves only when anexcessive charge of compressed fluid is contained within the cylinderand a smaller valve of relatively light weight and substantiallynoiseless adapted to be actuated when a normal charge of compressedfluid is contained therein.

For a better understanding of my invention reference may now be had tothe accompanying drawings of which Fig. 1 is a vertical cross-sectionalview of a two cylinder compressor provided with discharge valvesconstructed in accordance with my invention. Fig. 2 is a plan view ofthe structure illustrated in Fig. 1,

Fig. 3 is a bottom plan view of the valve closing member of the maindischargevalve.

In the drawings I have shown a double cylinder block 10 provided withpistons 11 and 12. Thetop of the cylinder block 10 is closed by means ofa cylinder head 13, containing an opening 14: opposite each cylinder,and secured thereto by means of bolts 15. Each piston 11 and 12 isprovidedwith an opening 16 in the topthereof, which is closed by meansofa valve member l'i, movable with respect to the piston but mountedthereon. Fluid to be compressed is drawn'from the'crankcase (not shown)of the compressor, through the piston and through the valve port 16 whenthe valve 17 is in its open position, thus admitting the charge to becompressed into the cylinder. p w 4 Eachof the openings .14: isprovided, at its lower edge with an annular inwardly projecting edge 20which serves as a valve seat. Disposed within each of the openings letis a hollow member 21, of substantially cupshape,

having an i nclined lower outer edge 22, side walls23 and a bottomsurface 2a. The bottom surface 2a s provided with a plurality ofcircumferentially arranged openings 25 extending therethrough. Theseopenings 25 are closed by means of a thin flexibledisk 26, which is heldin resilient engagement with the inner surfaceof the bottoinwall 2a bymeans of a relatively light helical compression spring 27'; The spring27 is retained concentrically disposed with respect to the disk 26 bymeans of anannular member 28, which is provided with acdownwardlyextending portion 29, disposed within the spring 27, the bottom of whichserves as an abutmentrfor the disk 26. Themember 28 is alsoprovided'withfa circumferential flange 30 which rests on top of the cupshaped 1116111.

:rests, or is held, in anannulargroove in the cylinder head 13,surrounding the opening 14,

by means of a clamping member 36 provided with bifurcated end portions37; which span the upper portions and engage the lower portions of thecap members 33. The member 36 is held in clamping engagement with themembers 33 by'means of a bolt 38 which passes through an opening 39adjacent the center thereof and is rigidly secured to the cylinder head13.

During the operation of the compressor the piston compresses the gaswithin the cylinder, which has previously been drawn through the pistonvalve port 16. If the charge within the cylinder is normal in volume thepressure of the gas, as the piston approaches'the upper end of itsstroke, is sufficient to raise the disk 26, against the action of thespring 27, into engagement with the bottom of the member 29, thusuncovering the many small valve ports 25. The gas compressed within thecylinder 10 thereupon passes through the openings in the member 21,throughthe openings 31 in the member 28 and through the opening 34 inthe member 33, from which it passes into any suitable tank'o-r reservoir(not shown). As soon as the gas has been vdischarged from the cylinder10 .thespring 27 moves the disk 26 back to its normal position, thusclosing the openings 25 as the piston begins its downward stroke. Thefact that the disk 26 is relatively light in weight renders itsubstantially noiseless in operation. 7

Iftheicharge of compressed gas in the cylinder 10 is unusually large, orif a quantity of oil in liquid form is contained therein, the opening ofthe *valve ports 25 will not provide a sufliciently quick relief and thepressure in the cylinder builds up. hen this occurs the pressure in thecylindersoon becomes sufliciently high to raise the member 21, and withit the 'members'26, '27 and 28, against the action not the spring 32,thus opening the main valve ports 14 and permitting the gas and oil topass, in addition to the pathway through the valve ports previouslydiscussed, through the main ports 14 and through laterally disposedpassageways 35 provided in the cylinder head 13, and thence into anysuitable receptacle (not shown). As soon as the pressure withinthecylinder is restored to a normal value the spring 32 moves the member 21again into engagement with the seat 22,-.thus closing .the main port 14,and the gas continues to'escape through theopenings=25 until thepressure thereof has reached a much lower'value, as previously;described. r

Although I have illustrated but one form of my invention'and havedescribed in detail but ,a single applicationthereof, it will beapparent to those skilled in the art that it is not so limited but thatvariousmodifications and changes may be made therein without departingvfrom the spirit of my invention or from the scope of the appendedclaims.

What I claim is:

1. A compressor valve mechanism comprising amember provided with a valveport, a

relatively movablevmember of substantially cup shape adapted to closesaid port and provided with relatively smaller valve ports in the basethereof, means disposed within said cup-shape member adapted to closesaid ports, an abutment member movably supported relativelyto saidcup-shape member and adapted to engage the upper edge of said cup-shapemember and provided with a portion extending into proximity to saidvalve port closing-means, a relatively weak spring disposed between saidabutment member and said valve port closing means, a relatively strongspring adapted to engage said abutment member'and adapted to hold it inresilient engagcment with said cup-shape member, and means for holdingsaid relatively strong spring in position. A compressor valve mechanismcomprising aperture therethrough having a constricted portion adjacentone end thereof constituting a valve seat, a cup-shape member disposedwithin said aperture engaging said seat and provided with a plurality ofvalve ports in the base thereof, a movable member disposed within saidcup-shape member and adapted to close the ports therein, an abutmentmember disposed within said aperture in engage ment with the upper edgeof said cup-shape member and having a portion extending thereinto inspaced relation with said port closing member, a relatively weak springdisposed within said cup-shape member between said abutment member andsaid port closing member, a cage secured adjacent the end of theaperture opposite the constricted portion, and a relatively strongspring secured within iaid cage and engaging said abutment memer.

In testimony whereof I hereunto affix my signature.

RALPH WV. DOEG.

a cylinder head provided with an '1

